Can I use FreeTEL System Telephones and Telephone Gateways Adapter behind a firewall?
Yes, it is possible to use any FreeTEL System Internet Telephones and Internet Telephone Gateways Adapter behind a firewall. FreeTEL System Internet Telephones and Internet Telephone Gateways Adapter have the advanced built-in automated NAT Transversal and Reversal features and theses features allows you to be inside or outside of a firewall.